Neutron powder diffraction of a novel magnetic phase in Sr2Rh1-xIrxO4
The ground state of correlated electron materials depends strongly on the strength of the on-site Coulomb repulsion U as well as the spin-orbit-coupling (SOC). While either of the interactions dominate materials of the 3d and 5d series, interesting physics arise when the couplings strengths are of similar scale, which is the case for materials of the 4d series. In the case of unconventional superconductor Sr2RuO4, tuning of the Coulomb interaction by calcium doping destroys the superconducting state and in turn creates a highly correlated antiferromagnetic Mott-insulator. In the compound Sr2Rh1-xIrxO4 in contrast, the strength of spin-orbit coupling increases by substituting the 5d transition metal iridium into Sr2RhO4, which resides next to the ruthenates in the periodic table. Sr2RhO4 shows paramagnetic Fermi-liquid behavior, while Sr2IrO4 is an antiferromagnetic insulator. For the mixed compound Sr2Rh0.6Ir0.4O4 a putative magnetically ordered state was recently reported. Since the nature of this phase has not been investigated so far we propose to perform neutron powder diffraction to resolve its magnetic structure.
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TREPKA Heiko; Thomas C. Hansen; HEPTING Matthias; KEIMER Bernhard and ZIMMERMANN Valentin. (2021). Neutron powder diffraction of a novel magnetic phase in Sr2Rh1-xIrxO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2814
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